KTM LC4 400 SXC, LC4 540 SXC Engine Technical Specifications

TECHNICAL SPECIFICATIONS – ENGINE 400/540 SXC ‘98
Engine
Design
Displacement
Bore / Stroke
Ratio
Fuel
Valve timing
Camshaft
Valve timing by 1 mm
valve clearence
Valve diameter
Valve clearence cold
Crank shaft bearing
Connecting rod bearing
Top end bearing
Piston
Piston rings
Engine lubrication
Engine oil
Engine oil quantity
Primary ratio
Clutch
Transmission
Gear ratio
Ignition system
Ignition timing
Generator
Spark plug
Spark plug gap
Cooling system
Cooling liquid
Starting equipment
400 LC4
540 LC4
Liquid-cooled single cylinder 4-stroke engine with and without balancer shaft
398 cm3
538,5 cm3
89 / 64 mm
95 / 76 mm
10,8 : 1
11,1 : 1
unleaded premium gasoline with a least RON 95
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
249° (249/1)
IO 22° BTDC EO 60° BBDC
IO 13° BTDC EO 53° BBDC
IC 42° ABDC EC 4° ATDC
IC 51° ABDC EC 11° ATDC
Intake: 36 mm Exhaust: 30 mm
Intake: 0,20 mm Exhaust: 0,20 mm
Intake: 0,15 mm Exhaust: 0,15 mm
2 cylinder roller bearing
needle bearing
bronze bushing
forged/cast aluminium alloy
1 compression ring, 1 taper face ring, 1 oil scraper ring
forced-feed lubrication through two Eaton-Oilpumps with oil sump
see bellow #
1,40liters
straight geared spur wheels 30 : 81 teeth
multi disc clutch in oil bath
5-speed claw shifted
1st
14:35
2nd
15:24
3rd
18:21
4th
20:19
5th
22:18
contactless thyristor ignition with electronic advanced system type SEM
400 SXC : adjustment to max. 38 ° BTDC at 6000 rpm
540 SXC: adjustment to max. 32 ° BTDC at 6000 rpm
12V 130W
NGK D8EA
0,6 mm
liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
1 liter, 40% antifreeze, 60% water, at least –25 ° C (–13 ° F)
decompressor automatic and hand actuated, cold and hot start knob on carburetor
TOLERANCE, ASSEMBLY CLEARANCE
Crank shaft
axial play .......................................0,03 - 0,12 mm (0,001-0,005 in)
run out of crank stud.......................max. 0,04 mm
(0,0016 in)
Connecting rod bearing radial play........................................max. 0,05 mm
(0,0019 in)
axial play .........................................max. 1,00 mm
(0,04 in)
Piston
assembly clearance 400/540/620....max. 0,12 mm
(0,005 in)
Piston rings end gap compression rings............................max. 0,60 mm
(0,023 in)
oil scraper ring.................................max. 0,80 mm
(0,031 in)
Valves
seat sealing intake ...........................max. 1,50 mm
0,059 in)
seat sealing exhaust.........................max. 2,00 mm
(0,079 in)
run out of valve heads.....................max. 0,03 mm
(0,001 in)
valve guides diameter......................max. 7,05 mm
(0,277 in)
Oil pump
clearance outer rotor - housing........max. 0,20 mm
(0,008 in)
clearance outer rotor - inner rotor....max. 0,20 mm
(0,008 in)
Bypaß valve
minimum spring lenght ...............................25 mm
(1 in)
Clutch discs
wear limit organic.......................................2,5 mm
(0,1 in)
Transmission shafts axial play ...........................................0,1 - 0,4 mm
(0,004 in)
Clutch
minimum clutchspring lenght..........34,5 mm (new 37 mm)(1,36 in - new 1,45 in)
#
TIGHTENING TORQUES - ENGINE
Hexagon nut at primary gear
M20x1,5
API: SF, SG, SH
Loctite 242 + 170 Nm (125 ft.lb)
TEMPERATURE
Collar nut flywheel
M12x1 LH thread
60 Nm
(44 ft.lb)
Hexagon nut for inner clutch hub
M18x1,5
Loctite 242 + 80 Nm
(59 ft.lb)
Kickstarter stop screw
M12x1,5
50 Nm
(37 ft.lb)
AH screws oil pump
M6
Loctite 242 + 8 Nm
(6 ft.lb)
Hexagon screw camshaft gear
M10
Loctite 242 + 35 Nm
(26 ft.lb)
AH screw cylinder head top sect.
M6x25
8 Nm
(6 ft.lb)
AH screw cylinder head top sect.
M6x50/M6x55 (12.9)
20 Nm
(15 ft.lb)
AH screw cylinder head top sect.
M6x65/M6x70 (8.8)
8 Nm
(6 ft.lb)
Cylinder head screws
M10
50 Nm
(37 ft.lb)
Collar nuts at cylinder base
M10
40 Nm
(30 ft.lb)
Engine oil
Hexagon screw chain sprocket
M10
Loctite 242 + 40 Nm
(30 ft.lb)
Oil drain plug
M22x1,5
30 Nm
(22 ft.lb)
Use only oil brands, which meet quality requirements
of API-classes SF, SG or SH (informations on bottles)
or higher. Both, mineral and synthetic oils with above
specifications can be used.
Magnetic plug
M12x1,5
20 Nm
(15 ft.lb)
Plug bypass valve
M12x1,5
20 Nm
(15 ft.lb)
Banjo bolts oil lines
M8x1
10 Nm
(7 ft.lb)
Banjo bolt oil lines
M10x1
15 Nm
(11 ft.lb)
Jet screw clutch cover
M8x1
10 Nm
(7 ft.lb)
Screw plug timing-chain tensioner
M12x1,5
20 Nm
(15 ft.lb)
Counternuts valve adjusting screws
M7x0,75
20 Nm
(15 ft.lb)
Spark Plug
M12
20 Nm
(15 ft.lb)
s
!
g
+
0°C
32°F
10W 40
10W 50
10W 60
15W 40
15W 50
15W 60
CAUTION
!
Poor oil quality or minor quantity effect early
engine-wear.
BASIC CARBURETOR SETTING
Carburetor
Carburetor setting number
Main jet
Needle jet
Idling jet
Jet needle
Needle position from top
Mixture.adju. screw open
Throttle valve
Starting jet
Performance restrictor
–
400 SXC
400 SXC (20 kW)
540 SXC
540 SXC (20 kW)
PHM 38 ND
120198
140
AB 265
50
K 32
II
1,5 turn
50/1
45
–
PHM 38 ND
120198
140
AB 265
50
K 32
II
1,5 turn
50/1
45
slide stop 56mm
VHSB 38 QS
081297
185
FN 260
33
K 32
II
1,5 turn
50
VHSB 38 QS
091297
140 (185)
FN 260
33
K 32
II
1,5 turn
50
40
slide stop 36mm
40
–